Flat-Earthers are having one heck of a week. Not only is one of these deniers of terrestrial sphericalness about to embark on a most audacious experiment, but they’ve now come to the attention of none other than Elon Musk.

But that’s exactly what he got, with the official Twitter account for the Flat Earth Society – don’t worry, they’re verified! – earnestly responding to the question.

According to whoever’s handling tweets for the Flat Earth Society these days, there’s a perfectly understandable explanation for why there’s no Flat Mars Society, and it all comes down to science.

“Hi Elon, thanks for the question. Unlike the Earth, Mars has been observed to be round,” the FES replied, “We hope you have a fantastic day!”

Of course, what’s so confusing about this perfectly amicable response is that it kind of flies in the face of conventional flat-Earther logic, which suggests scientific observations of Earth’s spherical shape are flawed or faked.